// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'package:quiver/iterables.dart' show IndexedValue;

/// Returns a [Stream] of [IndexedValue]s where the nth value holds the nth
/// element of [stream] and its index.
Stream<IndexedValue<T>> enumerate<T>(Stream<T> stream) {
  var index = 0;
  return stream.map((value) => IndexedValue<T>(index++, value));
}
